What you've to know that there are many types of bitcoin ATM obviously.
Some bitcoin ATM machines support buy and sell bitcoin and there are some types that support only buy bitcoin (for your cash).
Here the list
https://coinatmradar.com/manufacturers/Genesis Coin (674 locations)
General Bytes (304 locations)
Lamassu (242 locations)
BitAccess (48 locations)
BitXatm (36 locations)
BTC facil (23 locations)
Covault (21 locations)
Skyhook (15 locations)
LocalBitcoins (12 locations)
zzBit (7 locations)
CoinOutlet (7 locations)
BitTeller (6 locations)And, pay attention to bitcoin ATM fees and confirmation time as it will be different on each type of machine and depend on blockchain network.
That's so many Bitcoin ATM after all I just encountered 1 but I haven't use it yet because of lack of knowledge in using it even if there is an instruction on the side lol, maybe I am just lazy in using it, but it will be a big help if my country would add many ATM's that will let us exchange fiat money to bitcoin or vice versa that will be a hustle free from our side because we are currently using an ATM from a bank to exchange bitcoin to fiat, and the only availability of exchanging bitcoin to fiat is only 1 bank so a bitcoin ATM worldwide will be helpful.
Yeah, it can also help us especially to those who want a hassle free. Bitcoin ATM worldwide can be useful, but at this moment we don't have it here, I am just converting my bitcoin into fiat direct to my savings account so I can en-cash it directly to ATM Machines.